Springboot 集成Emqtt

一、引入jar包

pom.xml中增加一下以来

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-integration</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.integration</groupId>
    <artifactId>spring-integration-stream</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.integration</groupId>
    <artifactId>spring-integration-mqtt</artifactId>
</dependency>

二、增加配置

applicaion.yml配置如下

spring:
  mqtt:
    username: admin							# 账号
    password: public						# 密码
    host-url: tcp://ip:1883		            # mqtt连接tcp地址
    client-id: test							# 客户端Id，每个启动的id要不同
    default-topic: test						# 默认主题
    timeout: 100							# 超时时间
    keepalive: 100							# 保持连接数

三、mqtt配置类

import lombok.Data;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

/**
 * @Classname MtqqEntity
 * @Description mqtt相关配置信息
 */
@Component
@ConfigurationProperties("spring.mqtt")
@Data
public class MqttConfig {
    @Autowired
    private MqttPushClient mqttPushClient;

    /**
     * 用户名
     */
    private String username;
    /**
     * 密码
     */
    private String password;
    /**
     * 连接地址
     */
    private String hostUrl;
    /**
     * 客户Id
     */
    private String clientId;
    /**
     * 默认连接话题
     */
    private String defaultTopic;
    /**
     * 超时时间
     */
    private int timeout;
    /**
     * 保持连接数
     */
    private int keepalive;

    @Bean
    public MqttPushClient getMqttPushClient() {
        mqttPushClient.connect(hostUrl, clientId, username, password, timeout, keepalive);
        // 以/#结尾表示订阅所有以test开头的主题
        mqttPushClient.subscribe("test/#", 0);
        return mqttPushClient;
    }
}

四、mqtt推送客户端

import lombok.extern.slf4j.Slf4j;
import org.eclipse.paho.client.mqttv3.*;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * @Classname MqttPushClient
 * @Description mqtt推送客户端 
 */
@Component
@Slf4j
public class MqttPushClient {

    @Autowired
    private PushCallback pushCallback;

    public static MqttClient client;

    public static MqttClient getClient() {
        return client;
    }

    private static void setClient(MqttClient client) {
        MqttPushClient.client = client;
    }

    /**
     * 客户端连接
     *
     * @param host      ip+端口
     * @param clientID  客户端Id
     * @param username  用户名
     * @param password  密码
     * @param timeout   超时时间
     * @param keepalive 保留数
     */
    public void connect(String host, String clientID, String username, String password, int timeout, int keepalive) {
        MqttClient client;
        try {
            client = new MqttClient(host, clientID, new MemoryPersistence());
            MqttConnectOptions options = new MqttConnectOptions();
            options.setCleanSession(true);
            options.setUserName(username);
            options.setPassword(password.toCharArray());
            options.setConnectionTimeout(timeout);
            options.setKeepAliveInterval(keepalive);
            MqttPushClient.setClient(client);
            try {
                client.setCallback(pushCallback);
                client.connect(options);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    /**
     * 订阅某个主题
     *
     * @param topic 主题
     * @param qos   连接方式
     */
    public void subscribe(String topic, int qos) {
        log.info("开始订阅主题" + topic);
        try {
            MqttPushClient.getClient().subscribe(topic, qos);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }
}

五、消费监听类

import lombok.extern.slf4j.Slf4j;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * @Classname PushCallback
 * @Description 消费监听类 
 */
@Component
@Slf4j
public class PushCallback implements MqttCallback {

    @Autowired
    private MqttConfig mqttConfig;


    @Override
    public void connectionLost(Throwable throwable) {
        // 连接丢失后，一般在这里面进行重连
        log.info("连接断开，可以做重连");
        if (MqttPushClient.client == null || !MqttPushClient.client.isConnected()) {
            mqttConfig.getMqttPushClient();
        }
    }

    @Override
    public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception {
        // subscribe后得到的消息会执行到这里面
        log.info("接收消息主题 : " + topic);
        log.info("接收消息Qos : " + mqttMessage.getQos());
        log.info("接收消息内容 : " + new String(mqttMessage.getPayload()));
    }

    @Override
    public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {
        log.info("deliveryComplete---------" + iMqttDeliveryToken.isComplete());
    }
}

六、测试文件

import com.wang.emqtt.config.MqttPushClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/** 
 * @Description: 测试文件
 */
@RestController
@RequestMapping("/")
public class TestController {

    @Autowired
    private MqttPushClient mqttPushClient;

    @GetMapping(value = "/publishTopic")
    public String publishTopic() {
        mqttPushClient.publish(0,false,"test/test","测试一下发布消息");
        return "RUtils.ok()";
    }
}

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第一件事是热爱生活，好好的去爱身边的人；
第二件事是努力学习，在工作中取得不一样的成绩，实现自己的价值，而不是仅仅为了赚钱；